CN109081689A - A kind of method that alumina fibre enhancing opoka prepares cordierite ceramic - Google Patents

A kind of method that alumina fibre enhancing opoka prepares cordierite ceramic Download PDF

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CN109081689A
CN109081689A CN201810981832.4A CN201810981832A CN109081689A CN 109081689 A CN109081689 A CN 109081689A CN 201810981832 A CN201810981832 A CN 201810981832A CN 109081689 A CN109081689 A CN 109081689A
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ceramic
opoka
cordierite ceramic
alumina fibre
powder
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郭元
章波
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Wuhu Corey Yuen New Mstar Technology Ltd
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Wuhu Corey Yuen New Mstar Technology Ltd
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Abstract

The present invention relates to the methods that a kind of alumina fibre enhancing opoka prepares cordierite ceramic, the following steps are included: (1) is according to Modified Protein Earth: alumina powder: alumina fibre: magnesia: the ratio of the weight ratio 55:25:5:14:1 of sintering aid, raw material is put into agate jar, with planetary ball mill with 300rpm ball milling 3h, uniformly mixed powder is obtained；(2) binder of powder 10wt% is then added, deionized water, the ceramic slurry that allotment solid content is 50% is then added；(3) manufactured lotion is filled in mold after, dry-pressing formed using pressing machine die, briquetting pressure is 20 Μ Pa, and powder pressing is formed, then spontaneously dries for 24 hours, obtain ceramic batch by 2 min of pressure maintaining；(4) ceramic batch is sintered to get cordierite ceramic.Sintering aid of the invention is using raw talcum, feldspar, kaolin, cerium oxide, white and titanium dioxide, and it carries out removal of impurities and sintering processes, so that obtained sintering aid has excellent performance, the sintering temperature of cordierite ceramic can be effectively reduced, mechanical strength is improved, thermal expansion coefficient is reduced.

Description

A kind of method that alumina fibre enhancing opoka prepares cordierite ceramic
Technical field
The present invention relates to the methods that a kind of alumina fibre enhancing opoka prepares cordierite ceramic, belong to inorganic ceramic material Material field.
Background technique
Cordierite ceramic has higher-strength, excellent chemical stability and low thermal expansion, can be used as at vehicle exhaust Manage the preferred material of device carrier.Artificial synthesized cordierite powder is the main source of cordierite articles raw material.Utilize natural minerals Material, such as talcum, kaolin, montmorillonite are closed extensively for the research of Material synthesis cordierite ceramic technique and its performance Note.High purity oxygen compound synthesis of dichroite is MgO, SiO using high-purity2And Al2O3It is carried out by solid state reaction Prepare cordierite, and most traditional preparation method.This method has the features such as product purity is high, and Synthesis conversion is high.It Right mineral synthesis of dichroite has raw material sources wide, at low cost, the features such as being convenient for industrialized production.By can be in this method The raw material used has talcum, diatomite, feldspar and kaolin etc..Denomination of invention: application publication number CN102584191A uses snake The method that stone tailing system prepares cordierite ceramic, adopts serpentine tailing and Kaolin Tailings are primary raw material, while being added a small amount of Technique aluminium oxide cordierite ceramica material is prepared by ball milling, compression moulding, drying and sintering process.The invention is not only It solves pollution problem of the tailing bulk deposition to environment, and product can be made to reduce cost of material, preparation process is simple, is easy to Control, and sintering temperature is low, is suitable for industrialized production.But the porosity of the cordierite of this method preparation is low, intensity is low, Thermal expansion coefficient is high.
Summary of the invention
The present invention provides the methods that a kind of alumina fibre enhancing opoka prepares cordierite ceramic, solve existing violet The problems such as cordierite ceramic porosity is low, intensity is low and thermal expansion coefficient is high.
In order to solve the above technical problems, the technical solution adopted by the present invention are as follows:
A kind of method that alumina fibre enhancing opoka prepares cordierite ceramic, comprising the following steps:
(1) according to Modified Protein Earth: alumina powder: alumina fibre: magnesia: the weight ratio 55:25:5 of sintering aid: The ratio of 14:1, raw material are put into agate jar, with planetary ball mill with 300rpm ball milling 3h, obtain uniformly mixed powder Material；
(2) binder of powder 10wt% is then added, deionized water, the ceramics that allotment solid content is 50% are then added Slurry；
(3) manufactured lotion is filled in mold after, dry-pressing formed using pressing machine die, briquetting pressure is 20 Μ Pa, Pressure maintaining 2min forms powder pressing, then spontaneously dries for 24 hours, obtains ceramic batch；
(4) ceramic batch is sintered to get cordierite ceramic.
Further, a preferred embodiment of the present invention are as follows: the sintering aid, in parts by weight, including 30-40 parts Talcum, 20-30 part feldspar, 20-30 parts of kaolin, 1 part of cerium oxide, 3-5 parts of titanium dioxides.
Further, a preferred embodiment of the present invention are as follows: the preparation method of the Modified Protein Earth is a certain amount of to weigh After 600 DEG C of roasting 2h of opoka, according to liquid-solid ratio be 3: 1 addition concentration be 40% sulfuric acid, stir evenly, 100 DEG C, reaction 2h, Then it is rinsed with water to no sulfuric acid, it is dry.
Further, a preferred embodiment of the present invention are as follows: described being sintered to is to slowly warm up to the rate of 1 DEG C/min 300 DEG C, 2 hours are kept the temperature, then with 2 DEG C/min, 800 DEG C is warming up to, keeps the temperature 2 hours, it is small that 5 DEG C/min rises to 1350 DEG C of heat preservations 4 When be sintered, then furnace cooling.
Further, a preferred embodiment of the present invention are as follows: the preparation method of the sintering aid: (1) by talcum, length Stone, kaolin distinguish 600 DEG C of roasting 2h after, according to liquid-solid ratio be 4: 1 be added concentration be 30% sulfuric acid, stir evenly, 100 DEG C, 2h is reacted, is then rinsed with water to no sulfuric acid, it is dry；It (2) will treated talcum, feldspar, kaolin, cerium oxide and titanium dioxide It is uniformly mixed, then 4 DEG C/min rises to 1300 DEG C of heat preservations and is sintered for 3 hours, then furnace cooling；(4) the sinter powder that will be obtained Broken, ball milling is to get sintering aid.
Beneficial effects of the present invention:
The present invention is by addition sintering aid, and sintering aid is using raw talcum, feldspar, kaolin, cerium oxide, white and titanium white Powder, and it carries out removal of impurities and sintering processes, so that obtained sintering aid has excellent performance, can effectively reduce violet The sintering temperature of cordierite ceramic improves mechanical strength, reduces thermal expansion coefficient.
Opoka is also known as opal, is the active silica of a kind of aqueous noncrystalline or colloid, is a kind of amorphous silicon Matter mineral.Its chemical composition is SiO2.nH2O, wherein institute Si is amorphous structure, and main ingredient also contains small amounts in addition to Si Iron, aluminium oxide, manganese, copper and organic impurities etc..Opal rock is made of atomic small opal sphere, there is the hole of relatively development Gap has the features such as porosity is high, and water imbibition is strong, excellent adsorption.By modification, SiO2Content rises to 90% by 79%, And voidage greatly improves.The gap of cordierite ceramic can effectively be improved as pore creating material as major ingredient using opoka Rate reduces the dosage of binder, and then improves the intensity of product.
Alumina fibre is a kind of development situation of high-performance inorganic fibers, has the diversified forms such as long fine, short fibre, whisker.Aluminium oxide is fine 10-20 μm of diameter of dimension, density 2.7-4.2g/cm3, intensity 1.4-2.45GPa, modulus 190-385GPa, maximum operation (service) temperature is 1100-1400℃.High intensity, high-modulus, fabulous heat resistance and high-temperature oxidation are the outstanding advantages of alumina fibre.Separately The advantages that it is low that external oxidation aluminum fiber also possesses thermal expansion coefficient, good thermal shock, thermal conductivity is small.Compared with other fibers, oxidation Aluminum fiber can keep tensile strength under higher high temperature.Alumina fibre good surface activity is easy and ceramic matrix phase Match.
It is compound with opoka using alumina fibre, the bending intensity of cordierite ceramic on the one hand can be effectively improved, On the other hand the porosity can be improved.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical solution of the present invention is clearly and completely described, it is clear that institute The embodiment of description is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, Every other embodiment obtained by those of ordinary skill in the art without making creative efforts, belongs to this hair The range of bright protection.
Embodiment 1
A kind of method that alumina fibre enhancing opoka prepares cordierite ceramic, comprising the following steps:
(1) according to Modified Protein Earth: alumina powder: alumina fibre: magnesia: the weight ratio 55:25:5 of sintering aid: The ratio of 14:1, raw material are put into agate jar, with planetary ball mill with 300rpm ball milling 3h, obtain uniformly mixed powder Material；
(2) binder of powder 10wt% is then added, deionized water, the ceramics that allotment solid content is 50% are then added Slurry；
(3) manufactured lotion is filled in mold after, dry-pressing formed using pressing machine die, briquetting pressure is 20 Μ Pa, Pressure maintaining 2min forms powder pressing, then spontaneously dries for 24 hours, obtains ceramic batch；
(4) ceramic batch is sintered, described being sintered to is to slowly warm up to 300 DEG C with the rate of 1 DEG C/min, and heat preservation 2 is small When, then with 2 DEG C/min, be warming up to 800 DEG C, keep the temperature 2 hours, 5 DEG C/min rises to 1350 DEG C of heat preservations and is sintered for 4 hours, then with Furnace is cooling to get cordierite ceramic.
The preparation method of the Modified Protein Earth is after weighing 600 DEG C of roasting 2h of a certain amount of opoka, according to liquid-solid ratio It is 40% sulfuric acid that concentration, which is added, for 3: 1, is stirred evenly, 100 DEG C, and 2h is reacted, and is then rinsed with water to no sulfuric acid, dry.
The sintering aid, in parts by weight, including 30 parts of talcums, 30 parts of feldspars, 25 parts of kaolin, 1 part of oxidation Cerium, 3 parts of titanium dioxides.
The preparation method of the sintering aid: (1) after talcum, feldspar, kaolin being distinguished 600 DEG C of roasting 2h, according to Liquid-solid ratio is that 4: 1 addition concentration are 30% sulfuric acid, stirs evenly, 100 DEG C, reacts 2h, be then rinsed with water to no sulfuric acid, does It is dry；(2) by treated, talcum, feldspar, kaolin, cerium oxide and titanium dioxide are uniformly mixed, and then 4 DEG C/min rises to 1300 DEG C It keeps the temperature 3 hours and is sintered, then furnace cooling；(4) obtained sinter is crushed, ball milling is to get sintering aid.
Embodiment 2
A kind of method that alumina fibre enhancing opoka prepares cordierite ceramic, comprising the following steps:
(1) according to Modified Protein Earth: alumina powder: alumina fibre: magnesia: the weight ratio 55:25:5 of sintering aid: The ratio of 14:1, raw material are put into agate jar, with planetary ball mill with 300rpm ball milling 3h, obtain uniformly mixed powder Material；
(2) binder of powder 10wt% is then added, deionized water, the ceramics that allotment solid content is 50% are then added Slurry；
(3) manufactured lotion is filled in mold after, dry-pressing formed using pressing machine die, briquetting pressure is 20 Μ Pa, Pressure maintaining 2min forms powder pressing, then spontaneously dries for 24 hours, obtains ceramic batch；
(4) ceramic batch is sintered, described being sintered to is to slowly warm up to 300 DEG C with the rate of 1 DEG C/min, and heat preservation 2 is small When, then with 2 DEG C/min, be warming up to 800 DEG C, keep the temperature 2 hours, 5 DEG C/min rises to 1350 DEG C of heat preservations and is sintered for 4 hours, then with Furnace is cooling to get cordierite ceramic.
The preparation method of the Modified Protein Earth is after weighing 600 DEG C of roasting 2h of a certain amount of opoka, according to liquid-solid ratio It is 40% sulfuric acid that concentration, which is added, for 3: 1, is stirred evenly, 100 DEG C, and 2h is reacted, and is then rinsed with water to no sulfuric acid, dry.
The sintering aid, in parts by weight, including 35 parts of talcums, 25 parts of feldspars, 20 parts of kaolin, 1 part of oxidation Cerium, 4 parts of titanium dioxides.
The preparation method of the sintering aid: (1) after talcum, feldspar, kaolin being distinguished 600 DEG C of roasting 2h, according to Liquid-solid ratio is that 4: 1 addition concentration are 30% sulfuric acid, stirs evenly, 100 DEG C, reacts 2h, be then rinsed with water to no sulfuric acid, does It is dry；(2) by treated, talcum, feldspar, kaolin, cerium oxide and titanium dioxide are uniformly mixed, and then 4 DEG C/min rises to 1300 DEG C It keeps the temperature 3 hours and is sintered, then furnace cooling；(4) obtained sinter is crushed, ball milling is to get sintering aid.
Embodiment 3
A kind of method that alumina fibre enhancing opoka prepares cordierite ceramic, comprising the following steps:
(1) according to Modified Protein Earth: alumina powder: alumina fibre: magnesia: the weight ratio 55:25:5 of sintering aid: The ratio of 14:1, raw material are put into agate jar, with planetary ball mill with 300rpm ball milling 3h, obtain uniformly mixed powder Material；
(2) binder of powder 10wt% is then added, deionized water, the ceramics that allotment solid content is 50% are then added Slurry；
(3) manufactured lotion is filled in mold after, dry-pressing formed using pressing machine die, briquetting pressure is 20 Μ Pa, Pressure maintaining 2min forms powder pressing, then spontaneously dries for 24 hours, obtains ceramic batch；
(4) ceramic batch is sintered, described being sintered to is to slowly warm up to 300 DEG C with the rate of 1 DEG C/min, and heat preservation 2 is small When, then with 2 DEG C/min, be warming up to 800 DEG C, keep the temperature 2 hours, 5 DEG C/min rises to 1350 DEG C of heat preservations and is sintered for 4 hours, then with Furnace is cooling to get cordierite ceramic.
The preparation method of the Modified Protein Earth is after weighing 600 DEG C of roasting 2h of a certain amount of opoka, according to liquid-solid ratio It is 40% sulfuric acid that concentration, which is added, for 3: 1, is stirred evenly, 100 DEG C, and 2h is reacted, and is then rinsed with water to no sulfuric acid, dry.
The sintering aid, in parts by weight, including 40 parts of talcums, 20 parts of feldspars, 30 parts of kaolin, 1 part of oxidation Cerium, 5 parts of titanium dioxides.
The preparation method of the sintering aid: (1) after talcum, feldspar, kaolin being distinguished 600 DEG C of roasting 2h, according to Liquid-solid ratio is that 4: 1 addition concentration are 30% sulfuric acid, stirs evenly, 100 DEG C, reacts 2h, be then rinsed with water to no sulfuric acid, does It is dry；(2) by treated, talcum, feldspar, kaolin, cerium oxide and titanium dioxide are uniformly mixed, and then 4 DEG C/min rises to 1300 DEG C It keeps the temperature 3 hours and is sintered, then furnace cooling；(4) obtained sinter is crushed, ball milling is to get sintering aid.
The cordierite ceramic performance for measuring embodiment 1-3, specifically see the table below.
Thermal expansion coefficient/DEG C Open porosity/% Bending strength/(MPa)
Embodiment 1 1.56×10-6 43.2 45.6
Embodiment 2 1.53×10-6 42.3 44.8
Embodiment 3 1.51×10-6 43.2 44.9
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.

Claims (5)

1. a kind of method that alumina fibre enhancing opoka prepares cordierite ceramic, which comprises the following steps:
(1) according to Modified Protein Earth: alumina powder: alumina fibre: magnesia: the weight ratio 55:25:5:14:1 of sintering aid Ratio, raw material is put into agate jar, with planetary ball mill with 300rpm ball milling 3h, obtains uniformly mixed powder；
(2) binder of powder 10wt% is then added, deionized water, the ceramic slurry that allotment solid content is 50% is then added；
(3) manufactured lotion is filled in mold after, dry-pressing formed using pressing machine die, briquetting pressure is 20 Μ Pa, pressure maintaining 2 Min forms powder pressing, then spontaneously dries for 24 hours, obtains ceramic batch；
(4) ceramic batch is sintered to get cordierite ceramic.
2. the method that a kind of alumina fibre enhancing opoka according to claim 1 prepares cordierite ceramic, feature It is: the sintering aid, in parts by weight, including 30-40 parts of talcums, 20-30 parts of feldspars, 20-30 parts of kaolin, 1 Part cerium oxide, 3-5 parts of titanium dioxides.
3. a kind of alumina fibre enhancing opoka according to claim 1 prepares cordierite ceramic, it is characterised in that:
It is 3 according to liquid-solid ratio after the preparation method of the Modified Protein Earth is weighs 600 DEG C of roasting 2h of a certain amount of opoka: 1 is added concentration as 40% sulfuric acid, stirs evenly, 100 DEG C, reacts 2h, is then rinsed with water to no sulfuric acid, dry.
4. a kind of alumina fibre enhancing opoka according to claim 1 prepares cordierite ceramic, it is characterised in that: institute Being sintered to for stating is to slowly warm up to 300 DEG C with the rate of 1 DEG C/min, keeps the temperature 2 hours, then with 2 DEG C/min, is warming up to 800 DEG C, 2 hours are kept the temperature, 5 DEG C/min rises to 1350 DEG C of heat preservations and is sintered for 4 hours, then furnace cooling.
5. a kind of alumina fibre enhancing opoka according to claim 1 prepares cordierite ceramic, it is characterised in that: institute The preparation method for the sintering aid stated: (1) being 4 according to liquid-solid ratio after talcum, feldspar, kaolin being distinguished 600 DEG C of roasting 2h: 1 is added concentration as 30% sulfuric acid, stirs evenly, 100 DEG C, reacts 2h, is then rinsed with water to no sulfuric acid, dry；It (2) will processing Talcum, feldspar, kaolin, cerium oxide and titanium dioxide afterwards is uniformly mixed, and then 4 DEG C/min rises to 1300 DEG C and keeps the temperature 3 hours Sintering, then furnace cooling；(4) obtained sinter is crushed, ball milling is to get sintering aid.
CN201810981832.4A 2018-08-27 2018-08-27 A kind of method that alumina fibre enhancing opoka prepares cordierite ceramic Pending CN109081689A (en)

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CN110204323A (en) * 2019-05-31 2019-09-06 武汉科技大学 A kind of energy-saving cordierite zircon composite diphase material and preparation method thereof
CN115376769A (en) * 2022-08-30 2022-11-22 深圳陶陶科技有限公司 Carbon composite ceramic resistance card and preparation method and application thereof

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CN1210836A (en) * 1997-07-28 1999-03-17 康宁股份有限公司 Method of producing fast-fired cordierite bodies

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110204323A (en) * 2019-05-31 2019-09-06 武汉科技大学 A kind of energy-saving cordierite zircon composite diphase material and preparation method thereof
CN115376769A (en) * 2022-08-30 2022-11-22 深圳陶陶科技有限公司 Carbon composite ceramic resistance card and preparation method and application thereof

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